object has two materials at once? Why?
Your object is cloned.
You have a complete mesh (MECH_MESH) and the same but in 195 separate objects (MECH_MESH.001,MECH_MESH.002, ..., MECH_MESH.195). This could be for easy damage or something like that (?) but destroys the surface whan rendering (faces overlapping).  

Anyway, just select MECH_MESH (right click until you select the good one or use outliner) and move it to another layer (with M, 3 or number of your layer) to get a good render. Setting the objects on different layers will allow easy selection (and then deletion, hidding, toggle renderablity,...).